Filtration Membrane Discs
Thin, precut membrane rounds for high-throughput, fast filtration of liquid and gas samples. Gridded and non-gridded discs. Various materials including mixed cellulose ester, polycarbonate, PTFE, nylon, and PVDF. For air monitoring/analytical research.
Sizes
Filter membranes are made in a range of diameters, typically designed to fit a specific holder or manifold.
Materials
Filter membrane can be made from cellulose, mixed cellulose esters (MCE), polyvinylidene fluoride (PVDF), polyethersulfone (PES), polyvinyl chloride (PVC), polytetrafluoroethylene (PTFE), nylon, polycarbonate (PC), polyester, polyethylene terephthalate (PET), and polypropylene (PP). Other membrane materials include aluminum oxide, gelatin, porcelain, and glass.
Pore Size
The size of membrane pores determines which particles will be retained by the filter. A pore size of 0.2 µm is small enough to remove microbes from solutions; a 0.45 µm ore size can remove larger particulates.
Color and Grids
White membrane filters may be plain or marked with square grids (outlined in black) that can help with enumerating particles. Gridded or plain black membrane filters may be helpful when filtering light-colored particulates.
Sterility
Filter membranes may be pre-sterilized or may be sterilized using ethylene oxide, gamma irradiation, or autoclaves. The need for sterility is determined by the application, which are many and varied:
- Light microscopy samples
- Cytology sample preparation
- Electron microscopy samples
- Air quality and other environmental monitoring
- Water analysis and water quality testing
- Microbiology colony counting and quality control
- Chemotaxis
- Sterile preparation of buffers, tissue culture media, microbiological media, and other biological fluids
Cytiva Whatman™ PTFE Membrane Circles
Provides clarification of corrosives, solvents, and aggressive fluids. Whatman™ PTFE Membrane Circles are particularly useful in HPLC analysis when solid particles can cause permanent damage to the column.
Cytiva Whatman™ Nuclepore Hydrophilic Membrane
Nuclepore track-etched hydrophilic membranes with highly defined pore size cutoff in sub-micron range
Sartorius PTFE (Polytetrafluorethylene) Membrane Filters
Filter air and gasses, even at low differential pressures. Sartorius PTFE (Polytetrafluorethylene) Membrane Filters are permanently hydrophobic with low adsorption and excellent chemical compatibility. Choose from four pore sizes in a variety of diameters.
Fisherbrand™ General Filtration Membrane Filters
Useful for most filter applications
GVS Polycarbonate Track Etched (PCTE) Membrane, Hydrophilic, Disc, 20 μm
GVS Polycarbonate Track Etched (PCTE) Membranes are hydrophilic or hydrophobic and available in pore sizes from 0.01 to 20 μm.
MilliporeSigma™ Durapore™ Membrane Filters, 0.45 μm
Durapore™ Membrane Filters are recommended when maximum recovery is important.
Sartorius Gridded Nonsterile Cellulose Nitrate Membrane Filters: 1.2μm Pore Size
The non-sterile membrane filters are made of cellulose nitrate (cellulose mixed ester), cellulose acetate or regenerated cellulose. They can be used for colony counting, particle testing and microscopy. Choose between gridded or non-gridded, membranes, either with or without hydrophobic edge.
MilliporeSigma™ MF-Millipore™ Membrane Filter, 1.2 μm
Mixed cellulose esters (MCE) membrane, hydrophilic
GVS Polycarbonate Track Etched (PCTE) Membrane, Hydrophilic, Disc, 0.01 μm
GVS Polycarbonate Track Etched (PCTE) Membranes are hydrophilic or hydrophobic and available in pore sizes from 0.01 to 20 μm.
MilliporeSigma™ MF-Millipore™ Membrane Filter, 0.45 μm, Gridded
Mixed cellulose esters (MCE) membrane, hydrophilic
GVS Magna™ 47 mm Nylon Disc
A supported, naturally hydrophilic membrane designed to wet out evenly and retain its superior strength during use in general filtration or medical assays.
GVS MicronSep™ 25 mm White Nitrocellulose Disc
Mixed cellulose esters (MCE) filtration membrane is an unsupported, hydrophilic membrane. Its rapid flow rate and high throughput make it ideal for use in diagnostic kit manufacturing applications.
MilliporeSigma™ MF-Millipore™ Membrane Filter, 0.8 μm, Gridded
Mixed cellulose esters (MCE) membrane, hydrophilic
MilliporeSigma™ Isopore™ Membrane Filters, 0.8 μm
Use for analyses of airborne contaminants and other particles using optical or electron microscopy. Isopore™ Polycarbonate Membrane Filters have a smooth, glass-like surface for clearer sample observation. Available in a variety of pore sizes/flow rates, diameters and colors.